Clear 3D printed resin cases ordered from PCBWAYS option was UTR-8100 (transparent) finished in spray varnish. https://www.pcbway.com
T-Deck external notification wiring: Transistor 2N2222 GPIO PIN 48 1. Emitter to Ground on T-Deck 2. Base to GPIO PIN 48 3. Collector to negative side of LED or Vibro motor.